This mod includes a sentry gun as a singleplayer enemy. When making your map, add an entity called “monster_sentrygun” and place it anywhere you want in the map.
The sentry gun comes in three different types:
Light Sentry Gun:
This one starts with 100 health, it’s single-barrel and has a slow fire rate.
Medium Sentry Gun:
Starts with 150 health, it’s double-barrelled, and has a fast fire rate.
Heavy Sentry Gun:
Starts with 200 health, it’s triple-barrelled, has a fast fire rate and shoots rockets every 3 seconds.